Contact emails

fbeauf...@google.com, cwal...@google.com

Specification

https://gpuweb.github.io/gpuweb/#dom-gpusupportedlimits-maxbindgroupsplusvertexbuffers

Summary

The WebGPU maxBindGroupsPlusVertexBuffers limit is the maximum number of
bind group and vertex buffer slots used simultaneously, counting any empty
slots below the highest index. It is validated in createRenderPipeline()
and in draw calls. This change adds maxBindGroupsPlusVertexBuffers to the
GPUSupportedLimits interface, and as an accepted key by the
GPUDeviceDescriptor.requiredLimits record.

Blink component

Blink>WebGPU
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EWebGPU>

TAG review

None

TAG review status

Not applicable

Risks

Interoperability and Compatibility

The maxBindGroupsPlusVertexBuffers limit has not yet been implemented in
any browser, but it has been fully approved by the GPU for the Web
Community Group, with representatives from Safari, Firefox, and Chrome. See
https://github.com/gpuweb/gpuweb/issues/2749#issuecomment-1447717468

Gecko: Positive (https://hg.mozilla.org/mozilla-central/rev/5ed1439037c4)

WebKit: In development (
https://github.com/WebKit/WebKit/commit/26f539228dd0a3ee85e38e886753c41955e93971
)

Web developers: Positive (https://github.com/gpuweb/gpuweb/issues/2749)

Other signals:

WebView application risks

Does this intent deprecate or change behavior of existing APIs, such that
it has potentially high risk for Android WebView-based applications?

None at the moment, WebGPU currently does not ship on Android WebView.
Parallel work is occurring to launch WebGPU on Android.


Debuggability

No DevTools changes are required, treated like any other attribute.

Will this feature be supported on all six Blink platforms (Windows, Mac,
Linux, Chrome OS, Android, and Android WebView)?

No

All platforms will eventually have support. Will immediately be available
on ChromeOS, Mac, and Windows, since those platforms already support
WebGPU. Linux and Android are planned to have WebGPU support in the future,
so this feature will become available when WebGPU does.

Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
?

Yes

WebGPU/WGSL have a conformance test suite (https://github.com/gpuweb/cts)
that is regularly pulled into Chromium and part of the testing of Dawn/Tint
in Chromium.

Requires code in //chrome?

False

Tracking bug

https://bugs.chromium.org/p/dawn/issues/detail?id=1849

Availability expectation

Feature is available only in Chromium browsers for the near future, on the
order of months. Other browsers intend to ship WebGPU support, but don't
have specified timelines.

Non-OSS dependencies

Does the feature depend on any code or APIs outside the Chromium open
source repository and its open-source dependencies to function?

No

Estimated milestones

Shipping on desktop

120

Anticipated spec changes

Open questions about a feature may be a source of future web compat or
interop issues. Please list open issues (e.g. links to known github issues
in the project for the feature specification) whose resolution may
introduce web compat/interop risk (e.g., changing to naming or structure of
the API in a non-backward-compatible way).

None

Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/5081403763195904

This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.

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